TS80C31X2-LIE【PDF 32/42 页】IC MCU 8BIT 30/20MHZ 44-VQFP

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4428E–8051–02/08

AT/TS80C31X2

14.5.6

External Clock Drive Waveforms

Figure 14-10. External Clock Drive Waveforms

14.5.7

AC Testing Input/Output Waveforms

Figure 14-11. AC Testing Input/Output Waveforms

AC inputs during testing are driven at VCC - 0.5 for a logic “1” and 0.45V for a logic “0”. Timing

measurement are made at VIH min for a logic “1” and VIL max for a logic “0”.

14.5.8

Float Waveforms

Figure 14-12. Float Waveforms

For timing purposes a port pin is no longer floating when a 100 mV change from load voltage

occurs and begins to float when a 100 mV change from the loaded VOH/VOL level occurs. IOL/IOH

≥ ± 20mA.

14.5.9

Clock Waveforms

Valid in normal clock mode. In X2 mode XTAL2 signal must be changed to XTAL2 divided by

two.

CC-0.5 V

0.45 V

0.7V

0.2V

CC-0.1 V

CHCL

CLCX

CLCL

TCLCH

CHCX

0.45 V

CC-0.5 V

0.2V

CC+0.9

0.2V

CC-0.1

INPUT/OUTPUT

VOL+0.1 V

OH-0.1 V

FLOAT

VLOAD

VLOAD+0.1 V

LOAD-0.1 V

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